[gnome-software] plugin: Use the new launchable tag when launching apps

[Kalev Lember <klember src gnome org>]

commit 7685ea79fc8003c64db826f4e4267690dcc643c8
Author: Kalev Lember <klember redhat com>
Date:   Fri Jan 4 17:17:58 2019 +0100

    plugin: Use the new launchable tag when launching apps
    
    ... and fall back to the app ID if launchable isn't set.

 lib/gs-plugin.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/lib/gs-plugin.c b/lib/gs-plugin.c
index 28374bfc..d7db184f 100644
--- a/lib/gs-plugin.c
+++ b/lib/gs-plugin.c
@@ -945,7 +945,9 @@ gs_plugin_app_launch (GsPlugin *plugin, GsApp *app, GError **error)
        const gchar *desktop_id;
        g_autoptr(GAppInfo) appinfo = NULL;
 
-       desktop_id = gs_app_get_id (app);
+       desktop_id = gs_app_get_launchable (app, AS_LAUNCHABLE_KIND_DESKTOP_ID);
+       if (desktop_id == NULL)
+               desktop_id = gs_app_get_id (app);
        if (desktop_id == NULL) {
                g_set_error (error,
                             GS_PLUGIN_ERROR,